Stilbene dyestuffs and their manufacture



Patented Jan. 20, 1942 UNITED STATES STILBENE. DYEST'UFFS AND THEIR MANUFACTURE Ernst Keller, Basel, Switzerland, assignor to the firm J. R. Geigy A. G., Basel, Switzerland No Drawing. Application June 12, 1940, Serial No. 340,177. In Switzerland July 3, 1939 Claims.

This invention relates to a process for the production of stilbene dyestuffs, whereby products with substantially improved properties of fastness can be produced.

It is well known to condense, if necessary under pressure, dinitrostilbene disulphonic acid, dinitrodibenzyl .disulphonic acid or p-nitrotoluene sulphonic acid, in molecular or any suitable proportions, with aromatic amino compounds, especially monoaminoazo dyestuffs or mixtures of these dyestuifs. A subsequent treatment of the condensation products and/or oxidising media, leads to derivatives with improved fastness properties. It has now been found that according to the above reaction, products with substantially improved properties of fastness are obtained by using wholly or partly in the above mentioned reaction, instead of the known aromatic amino compounds, aminoazobenzene compounds of the general formula:

JIC 7 011 A N= 1 Z wherein X represents a hydroxyl, alkoxy or carboxyl group, or a substituent exchangeable for hydroxyl, Y represents a benzene nucleus substituted by an amino group and, if desired, still ylbenzene, 2:5-dimeth0xyaniline and so on. As

- coupling components may be cited for example:

with metal yielding further substituted, which is linked with the forming in o-position to the nucleus standing N- atom a hetero ring by means of a N-, S- or O- atom, and Z represents C'OOI-I, SOaH or H, but at least once COO-H or SOsH, and wherein the benzene nucleus A may be further substituted.

The production of the aminoazodyestuffs according to the above formula is efiected according to usual processes by coupling the diazobenzene compounds coming into question with the hydroxynaphthalene derivatives coming into question. As dia-zo components may be mentioned for example: Z-amino-l-hydroxybenzene- 4-sulphonic acid, 4-chloro-2-amino-1-hydroxybenzene-fi-sulphonic acid, 4-chloro-2-amino-1- hydroxybenzene-fi-sulphonic acid, 6-ch1oro-2- amino l-hydroxybenzenel-sulphonic acid, 3- amino-2-hydroxy-5-sulphobenzoic acid, 2-amino- 4-methoxybenzoic acid, 3-amino-4-methoxyor 4-hydroxybenzoic acid, 4-nitro-2-amino 1 hydroxybenzene, 5-nitro-2-amino-1 hydroxybenzene, 4-chloro-2-amino-l -hydroxybenzene, lmethyl 2 amino-l-hydroxybenzene, 4-chloro- 6-nitro-2-amino-l-hydroxybenzene, 4-methyl-6- nitro-2-amino-l-hydroxybenzene, 4 6-dinitro-2- amino-l-hydroxybenzene (picramic acid), 5-mtro-Z-aminoanisol, l-amino-2-meth0xy-5-meth 3-amino-C-phenyl-1:2-N-thiazolo 5 hydroxynaphthalene-'Z-sulphonic acid, 4-amino-C-phenyl-l 2-N-thiazolo-S-hydroxynaphthalene-7 sulphonic acid, 3'-amino-C-phenyl-1:2-N-thiazolo- 8-hydroxynaphthalene 6 sulphonic acid, 3'- amino-C-phenyl-2:l-N-thiazolo 8 hydroxynaphthalene-3:B-disulphonic acid (made according to the German Patent 165,126), 3'-amino C-phenyl-(N) -2 oxazolo '5 hydroxynaphthalene-l-sulphonic acid, 3'-amino-C-phenyll 2 (N) -imidazolo-5-l1ydroxynaphthalene-7 sulphonic acid, 4' amino-phenyl-5-hydroxy-7-sulphonaphthyl-lzZ-triazol, 3-aminophenyl-8 hy- .droxy-3 :6-disulphonaphthyl-1:Z-triazol, 4'-aminophenyl-2-azimino-5 hydroxynaphthalene-7 sulphonic acid, 4'-aminophenyl-2-amino-5-hydroxynaphthalene-7-su1phonic acid, fi-benzidinohydroxynaphthalene-l-sulphonic acid-3; 6-(4- aminoanilino) hydroxynaphthalene 1 sulphonic acid-3 '3'-amino6-methyl-5-hydroxy-7- sulphonaphthyl-l Z-triazol, 4'-amino-2"-chloro- 5-hyd.roxy-7-sulphonaphthyl-1:2-tri-azol and so The new metallised dyestuffs distinguish themselves from similar known .dyestufis, which are obtained by condensation under pressure of the aminoazodyestufis from 4-chloro-2-amino-l-hydroxybenzene or 4-chloro-2-amino-1-hydroxybenzerie-B-sulphom'c acid and 2-amino-5-hydroxynaphthalene-7-sulphonic acid with dinitrostilbene-disulphonic acid and which are metallised before or after the condensation, in general by much better properties of fastness to acid, alkali or light or by a notable improvement of all the said fastness properties.

The following examples illustrate the invention, the parts being by weight:

Example 1 53.7 parts of the dyestuif produced by coupling diazotised 4-nitro-2-amino 1 hydroxybenzene with 3'-amino-C-phenyl-1:2-N thiaz01o-5 hydroxynaphthalene-7-sulphonic acid in a sodaalkaline' solution in presence of pyridine are condensed for 12 hours at 100-105 C. under reflux with 47.4 parts of dinitrostilbene .disulphonate of sodium in 250 parts of Water and 50 parts of caustic soda lye of 36 B. After cooling the caustic soda lye is neutralised with hydrochloric acid, whereupon the dyestuff is completely precipitated with common salt and filtered off.

Themoist filter cake of the dyestufi is mixed in 1600 parts of water at a weakly congo-acid reaction with 25 parts of crystallised coppersulphate which is dissolved in 100 parts of water, and the mixture is heated for 8 hours to C. A sample must distinctly indicate a trace of copper excess in the outflow and this until the end thereof. The dyestuff is then salted out,

filtered and one more precipitated from" a soda? 1 alkaline'solution. It constitutes, when dried, a

dark violet powder which dissolves in water with red-brown coloration and in concentrated sulphuric acid with violet coloration. The dyestufi dyes cotton of full, very light-fast brown shades.

If 1074 parts of the above described aminoazo dyestuff are condensed for 12 hours at 100- 105 C. with 47.4 parts of dinitrostilbene disulphonate of sodium in 500 parts of water and 100 parts of caustic soda lye of 36 B. and if the condensation product is coppered in a congoacid medium or, as described in Example 3, in an ammonia-alkaline solution, there is obtained a dyestuif which dissolves in water with bordeauxred coloration and in concentrated sulphuric acid with violet coloration and which dyes cotton of violet-brown shades of very good fastness to light- Example 2 52.1 parts of the dyestufi produced .by coupling diazotised 4 nitro- 2- amino-l-hydroxybenzene with p-aminophenyl--hydroxy-7-sulphonaphthyl-lzZ-triazol in a mimosa-alkaline solution in presence of pyridine are condensed for 18 hours under reflux at 100-105 C. with 47.4 parts of dinitrostilbene disulphonate of sodium in 330 parts of water and 70 parts of caustic soda lye of 36 B. and the whole is worked up as described in Example 1. The dyestufi constitutes, when dried, a dark, grey-violet powder; it dissolves in water with orange-brown coloration and in concentrated sulphuric acid with violet coloration and dyes cotton of yellow-brown shades. By after-treatment of the dyeings in the usual manner with copper-sulphate, a high improvement of the fastness to light and washing is obtained.

The dyestuif can, of course, also be converted in the usual manner in substance into the copper compound. The copper-containing dyestufi shows the same properties as the dyeings of the metal-free dyestuff after-treated with copper- Salts- Example 3 27.1 parts of the saponified dyestufi from m-aminobenzoic acid and o-methoxy-phenylaminomethyl-sulphonic acid and 52.7 parts of the dyestufi prepared by coupling diazotised 4-chloro-2-amino-l-hydroxybenzene with 3- amino-C-phenyl -1:2 N thiazolo 5 hydroxynaphthalene-7-sulphonic acid in a soda-alkaline solution in presence of pyridine are condensed for 10 hours according to usual method with 47.4 parts of dinitrostilbenedisulphonate of sodium in 600 parts of water and 80 parts of caustic soda lye of 36 B. and the whole is Worked up as described in Example 1.

The moist filter cake is dissolved in 1200 parts of water at 80 C. and a solution produced from parts of crystallised copper-sulphate in 100 parts of water and 50 parts of ammonia of 25% strength is added thereto. The whole is heated, while stirring, for 6 hours to 80-90 C. and the coppered dyestuff is precipitated out by means of common salt. It constitutes, when dried, a dark violet powder which dissolves in water with brown coloration and in concentrated sulphuric acid with navy-blue coloration and dyes cotton of brown shades of good fastness to light, alkali a d acid. Examp 4 25.3 parts of the dyestuff from 2-amino-1- hydroxybenzene-4-sulphonic acid and 2:5-dimethoxy-aniline and 53.7 parts of the dyestufi 4-nitro-2-amino-1-hydroxybenzene-3'amino-C phenyl- 1 :2-N-thiazolo-5-hydroxynaphthalene-7 sulphonic acid are condensed for 18 hours in usual manner with 47.4 parts of dinitrostilbenedisulphonate of sodium in 600 parts of water and parts of caustic soda lye of 36 B. The isolated condensation product is coppered for 12 hours in an ammonia-alkaline solution, as described in Example 3. The coppered dyestufi constitutes, when dried, a black powder, dissolves in water with dark violet coloration and in concentrated sulphuric acid with violet coloration and dyes cotton of grey shades of very high fastness to light.

By varying the proportion between the aminoazo-dyestufi and the dinitrostilbene disulphonic acid the shade of the dyestuffs canbe influenced. If in the above example instead of 53.7 parts of the dyestuiT 4-nitro-2-amino-l-hydroxybenzene 3'-amino-C-phenyl 1:2 N-thiazolo-5-hydroxynaphthalene-7-sulphonic acid, there are used underthesame conditions for the condensationfor instance 35 parts only of the said dyestufi, a dyestuif is obtained whose copper-compound yields in dyeing somewhat more greenish-grey shades.

The following table gives some further dyestuffs obtainable according to the present invention, whereby for sake of simplicity only the both limit-cases of the condensation, i. e. the condensation of one or two molecules of the aminoazo dyestuff with one molecule of dinitrostilbenedisulphonic acid are indicated.

Further dyestufi's may be produced according to the above examples by means of the components enumerated in the general part of the specification. They all possess, in general the same or similar shades and tinctorial properties.

Table Molecular proportion of bctondensation Shade of the d e ween 8.1111110- copper compoun Ammoazo (1365mm azo dyestufi of the dyestufl and dinitroon cotton stilbene disulphonic acid 4-nitro-2-an1in0-l-hydroxyben- Zone 3-amino-C-phenyll:l Brown. 1:2-N-thiazolo-8-hydroxynaph- 2:1 Violet-brown. thalene-G-sulphonic acid. Picramic acid 3-amino-O- phenyl-1z2-N-thiazolo -8-hy- 1:1 Rcddish-brown. giroxynaphthalcne-6-sulphon- 2:1 Do. 10 acid. 4-nitro-2-amino-1-hydroxybenzene 3-amino-O-phenyl-1:2 1:1 Do. (N) imidazolo 5 hydroxy- 2:1 Bordeaux. naphthalene-7-sulphonic acid. 3 -amino -4-metl1oxy- 1 -methylbenzene 3-amino-C-phenyl- 1:1 Brown. 1:2 N thiazolo 5 hydroxy- 2:1 Dark-brown. naphthalene-7-su1phonic acid. 2-anfiino-lhydgoxybegrzcne-tsxp mile 2101 -aminophenyl-1:2-N-tl1iazolo-5-hyggggggg gggg droxynaphthalenc-7-sulph0n- 1c acid. Dehydrothio p toluidino sul- 4 gllioniczacid and h d b -c oro- -amino-ly roxyen- Zena Each time 1.1.. Bro n-clivc. 1:2 N thiazolo 5 hydroxynaphthalene-7-sulphonic acid. Sulphamlic acid o-rncthoxyphenylaminomcthylsulphonic ac d saponified and 4 nltro 2 amino l hydroxy- Each time 1 :1 Bed-brown.

benzene 3-amino-C-pl1enyl- 1 :2-N -thiazolo-8-l1ydroxynaphthalene-fi-sulphonic acid Sulphanilic acid 1-amino'2:5- 4 dinilethylbenzene and n1 ro 2 amino 1 hydroxybcnzene 3-amino-C-phcnyl- Each time Brown 1:2-N-thiazolo-5-hydroxynaphthalene-7-sulphonic acid. 2-ch1oraniline-S-sulphonic acid 4 2:5-dimetl1cxyaniline andn1 .ro 2 amino 1 hydroxybenzenea3, amino C pheny1 Each time l.l Brmui. 1:2-N-thiazolo-5-hydroxynapl1- thalene-7-sulphonic acid What I claim is:

1. In the manufacture of stilbene dyestufis by condensation of dinitrostilbene disulphonic acid, dinitrodibenzyl disulphonic acid or p-nitrotoluenesulphonic acid with aromatic compounds which contain free amino groups in any proportion, in presence of caustic alkalies, with or without th application of pressure, and if desired subsequent treatment of the products with metal yielding and/or oxidising agents, the improvement wherein instead of the known aromatic amino compounds there are used on one molecule of dinitrostilbene disulphonic acid, dinitrodibenzyl disulphonic acid and equimolecular parts of p-nitrotoluene sulphonic acid from substantially one to two molecules of aminoazobenzene dyestufis of the general formula:

wherein X represents one member of the group consisting of hydroxyl, alkoxy, carboxyl and halogen, Y represents a benzene nucleus substituted by an amino group and linked to the naphthalene nucleus by a member of the group consisting of dinitrodibenzyl disulphonic acid or p-nitrotoluenesulphonic acid with aromatic compounds which contain free amino groups in any proportion, in presence of caustic alkalies, with or without the application of pressure, and if desired subsequent treatment of the products with metal wherein X represents one member of the group consisting of hydroxyl, alkoxy, carboxyl and halogen, Y represents a benzene nucleus, substituted by an amino group and linked to the naphthalene nucleus by a member of the group consisting of (nn) meaning naphthalene nucleus and (bn) meaning benzene nucleus, Z represents one member of the group consisting of COOH, SO3H and H, but at least once one of the members COOH and SOaH, and W represents one member of the group consisting of H, CH3 and OCH3.

3. In the manufacture of stilbene dyestuffs by condensation of dinitrostilbene disulphonic acid, dinitrodibenzyl disulphonic acid or p-nitrotoluenesulphonic acid with aromatic compounds which contain free amino groups in any proportion, in presence of caustic alkalies, with or without the application of pressure, and if desired subsequent treatment of the products with metal yielding and/or oxidising agents, the improvement wherein instead of the known aromatic amino com-pounds there are used on one molecule of dinitrostilbene disulphonic acid, dinitrodibenzyl disulphonic acid and equimolecular parts of p-nitrotoluene sulphonic acid from substantially one to two molecules of aminoazobenzene dye-3 stuffs of the general formula:

(nn) meaning naphthalene nucleus and. (bn) meaning benzene nucleus, Z represents one member of the group consisting of COOI-I, SOaH and H, but at least once one of the members COOH and SOsH, and W1 represents one member of the group consisting of H, N02 and Cl.

4. In the manufacture of stilbene dyestuffs the step of condensing the coupling product of diazotised 4-nitro-2-amino-l-hydroxybenzene and 3- amino-C-phenyl- 1:2-N-thiazo1o-5-hydroxynaphthalene-'7-sulphonic acid with dinitrostilbene-disulphonate of sodium.

5. In the manufacture of stilbene dyestuffs the step of condensing the coupling product of diazotised 4-nitro-2-amino-l-hydroxybenzene and 3- amino-C-phenyl- 1 2-N-thiazolo-5-hydroxynaphthalene-7 -sulphonic acid with dinitrostilbene-disulphonate of sodium and subsequently coppering the thus obtained dyestuff.

6. In the manufacture of stilbene dyestuffs the step of condensing the coupling product of diazotised 4-nitro-2-amino-1-hydroxybenzene and pamino-phenyl--hydroXy-7-sulphonaphthyl- 1 2- triazol with dinitrostilbenedisulphonate of sodium.

7. In the manufacture of stilbene dyestuffs the step of condensing the coupling product of diazotised l-nitro-Z-amino-l-hydroxybenzene and pamino-phenyl-5-hydroxy-7-sulphonaphthyl-1 2- triazol with dinitrostilbenedisulphonate of sodium and subsequently coppering the thus obtained dyestuif.

8. In the manufacture of stilbene dyestuffs the step of condensing the coupling product of 2- amino-1-hydroxybenzene-4-sulphonic acid and the dyestuff from 4.-nitro-2-amino-l-hydroxywherein X represents one member of the group consisting of hydroxyl, alkoxy, carboxyl and halogen, Y represents a benzene nucleus substituted by an amino group and linked to the naphthalene nucleus by a member of the group consisting of (nn) meaning naphthalene nucleus and (ion) meaning benzene nucleus, and Z represents one member of the group consisting of COOH, SOsH and H, but at least once one of the members COOH and SOsH.

11. The new stilbene dyestuffs from the condensation with dinitrostilbene disulphonic acid of an aminoazobenzene dyestuff of the general formula:

Iii OH wherein X represents one member of the group consisting of hydroxyl, alkoxy, carboxyl and halogen, Y represents a benzene nucleus substituted by an amino group and linked to the naphthalene nucleus by a member of the group con sisting of I (bn) (nn) meaning naphthalene nucleus and (bn) meaning benzene nucleus, Z represents one member of the group consisting of COOH, SOcH and H, but at least once one of the members COOH and SOsH, and W represents one member of the group consisting of H, CH3 and OCH3.

12. The new stilbene dyestuffs from the condensation with dinitrostilbene disulphonic acid of an aminoazobenzene dyestufi of the general formula:

wherein X represents one member of the group consisting of hydroxyl, alkoxy, carboxyl and halogen, Y represents a benzene nucleus substituted by an amino group and linked to the naphthalene nucleus by a member of the group consisting of H (nn)-l l(bn) ERNST KELLER. 

